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Vidal CP, Velásquez E, Gavara R, Hernández-Muñoz P, Muñoz-Shugulí C, José Galotto M, de Dicastillo CL. Modeling the release of an antimicrobial agent from multilayer film containing coaxial electrospun polylactic acid nanofibers. J FOOD ENG 2023. [DOI: 10.1016/j.jfoodeng.2023.111524] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/05/2023]
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2
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Zhang Z, Jia S, Wu W, Xiao G, Sundarrajan S, Ramakrishna S. Electrospun transparent nanofibers as a next generation face filtration media: A review. BIOMATERIALS ADVANCES 2023; 149:213390. [PMID: 36963249 DOI: 10.1016/j.bioadv.2023.213390] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/22/2022] [Revised: 03/10/2023] [Accepted: 03/14/2023] [Indexed: 03/19/2023]
Abstract
The development of fascinating materials with functional properties has revolutionized the humankind with materials comfort, stopped the spreading of diseases, relieving the environmental pollution pressure, economized government research funds, and prolonged their serving life. The outbreak of Coronavirus Disease 2019 (COVID-19), which is caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), has triggered great global public health concern. Face masks are crucial tools to impede the spreading of SARS-CoV-2 from human to human. However, current face masks exhibit in a variety of colors (opaque), like blue, black, red, etc., leading to a communication barrier between the doctor and the deaf-mute patient when wearing a mask. High optical transparency filters can be utilized for both personal protection and lip-reading. Thus, shaping face air filter into a transparent appearance is an urgent need. Electrospinning technology, as a mature technology, is commonly used to form nanofiber materials utilizing high electrical voltage. With the alteration of the diameters of nanofibers, and proper material selection, it would be possible to make the transparent face mask. In this article, the research progress in the transparent face air filter is reviewed with emphasis on three parts: mechanism of the electrospinning process and light transmission, preparation of transparent face air filter, and their innovative potential. Through the assessment of classic cases, the benefits and drawbacks of various preparation strategies and products are evaluated, to provide general knowledge for the needs of different application scenarios. In the end, the development directions of transparent face masks in protective gear, particularly their novel functional applications and potential contributions in the prevention and control of the epidemic are also proposed.
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Affiliation(s)
- Zongqi Zhang
- School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, China; Faculty of Mechanical Engineering, National University of Singapore, 117574, Singapore
| | - Shuyue Jia
- Faculty of Mechanical Engineering, National University of Singapore, 117574, Singapore; School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, China
| | - Wenting Wu
- School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, China
| | - Guomin Xiao
- School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, China.
| | - Subramanian Sundarrajan
- Faculty of Mechanical Engineering, National University of Singapore, 117574, Singapore; Department of Prosthodontics, Saveetha Dental College and Hospitals, Saveetha Institute of Medical & Technical Sciences, Saveetha University, Chennai 600077, Tamil Nadu, India.
| | - Seeram Ramakrishna
- Faculty of Mechanical Engineering, National University of Singapore, 117574, Singapore.
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3
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Attia AAM, Abas KM, Ahmed Nada AA, Shouman MAH, Šišková AO, Mosnáček J. Fabrication, Modification, and Characterization of Lignin-Based Electrospun Fibers Derived from Distinctive Biomass Sources. Polymers (Basel) 2021; 13:2277. [PMID: 34301035 PMCID: PMC8309332 DOI: 10.3390/polym13142277] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2021] [Revised: 07/06/2021] [Accepted: 07/09/2021] [Indexed: 11/16/2022] Open
Abstract
From the environmental point of view, there is high demand for the preparation of polymeric materials for various applications from renewable and/or waste sources. New lignin-based spun fibers were produced, characterized, and probed for use in methylene blue (MB) dye removal in this study. The lignin was extracted from palm fronds (PF) and banana bunch (BB) feedstock using catalytic organosolv treatment. Different polymer concentrations of either a plasticized blend of renewable polymers such as polylactic acid/polyhydroxybutyrate blend (PLA-PHB-ATBC) or polyethylene terephthalate (PET) as a potential waste material were used as matrices to generate lignin-based fibers by the electrospinning technique. The samples with the best fiber morphologies were further modified after iodine handling to ameliorate and expedite the thermostabilization process. To investigate the adsorption of MB dye from aqueous solution, two approaches of fiber modification were utilized. First, electrospun fibers were carbonized at 500 °C with aim of generating lignin-based carbon fibers with a smooth appearance. The second method used an in situ oxidative chemical polymerization of m-toluidine monomer to modify electrospun fibers, which were then nominated by hybrid composites. SEM, TGA, FT-IR, BET, elemental analysis, and tensile measurements were employed to evaluate the composition, morphology, and characteristics of manufactured fibers. The hybrid composite formed from an OBBL/PET fiber mat has been shown to be a promising adsorbent material with a capacity of 9 mg/g for MB dye removal.
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Affiliation(s)
- Amina Abdel Meguid Attia
- Laboratory of Surface Chemistry and Catalysis, National Research Center, 33 El-Bohouth St., Giza 12622, Egypt; (K.M.A.); (M.A.H.S.)
| | - Khadiga Mohamed Abas
- Laboratory of Surface Chemistry and Catalysis, National Research Center, 33 El-Bohouth St., Giza 12622, Egypt; (K.M.A.); (M.A.H.S.)
| | - Ahmed Ali Ahmed Nada
- Pretreatment and Finishing of Cellulose Based Textiles Department, National Research Center, Giza 12622, Egypt;
- Centre for Advanced Materials Application, Slovak Academy of Sciences, Dubravska Cesta 9, 845 11 Bratislava, Slovakia
| | - Mona Abdel Hamid Shouman
- Laboratory of Surface Chemistry and Catalysis, National Research Center, 33 El-Bohouth St., Giza 12622, Egypt; (K.M.A.); (M.A.H.S.)
| | - Alena Opálková Šišková
- Polymer Institute, Slovak Academy of Sciences, Dubravska Cesta 9, 845 41 Bratislava, Slovakia;
| | - Jaroslav Mosnáček
- Centre for Advanced Materials Application, Slovak Academy of Sciences, Dubravska Cesta 9, 845 11 Bratislava, Slovakia
- Polymer Institute, Slovak Academy of Sciences, Dubravska Cesta 9, 845 41 Bratislava, Slovakia;
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4
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Velásquez E, Patiño Vidal C, Rojas A, Guarda A, Galotto MJ, López de Dicastillo C. Natural antimicrobials and antioxidants added to polylactic acid packaging films. Part I: Polymer processing techniques. Compr Rev Food Sci Food Saf 2021; 20:3388-3403. [PMID: 34118127 DOI: 10.1111/1541-4337.12777] [Citation(s) in RCA: 27] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2020] [Revised: 04/09/2021] [Accepted: 04/23/2021] [Indexed: 12/17/2022]
Abstract
Currently, reducing packaging plastic waste and food losses are concerning topics in the food packaging industry. As an alternative for these challenges, antimicrobial and antioxidant materials have been developed by incorporating active agents (AAs) into biodegradable polymers to extend the food shelf life. In this context, developing biodegradable active materials based on polylactic acid (PLA) and natural compounds are a great alternative to maintain food safety and non-toxicity of the packaging. AAs, such as essential oils and polyphenols, have been added mainly as antimicrobial and antioxidant natural compounds in PLA packaging. In this review, current techniques used to develop active PLA packaging films were described in order to critically compare their feasibility, advantages, limitations, and relevant processing aspects. The analysis was focused on the processing conditions, such as operation variables and stages, and factors related to the AAs, such as their concentrations, weight losses during processing, and incorporation technique, among others. Recent developments of active PLA-based monolayers and bi- or multilayer films were also considered. In addition, patents on inventions and technologies on active PLA-based films for food packaging were reviewed. This review highlights that the selection of the processing technique and conditions to obtain active PLA depends on the type of the AA regarding its volatility, solubility, and thermosensitivity.
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Affiliation(s)
- Eliezer Velásquez
- Packaging Innovation Center (LABEN), University of Santiago of Chile (USACH), Santiago, Chile.,Center for the Development of Nanoscience and Nanotechnology (CEDENNA), University of Santiago of Chile (USACH), Santiago, Chile
| | - Cristian Patiño Vidal
- Packaging Innovation Center (LABEN), University of Santiago of Chile (USACH), Santiago, Chile.,Center for the Development of Nanoscience and Nanotechnology (CEDENNA), University of Santiago of Chile (USACH), Santiago, Chile
| | - Adrián Rojas
- Packaging Innovation Center (LABEN), University of Santiago of Chile (USACH), Santiago, Chile.,Center for the Development of Nanoscience and Nanotechnology (CEDENNA), University of Santiago of Chile (USACH), Santiago, Chile
| | - Abel Guarda
- Packaging Innovation Center (LABEN), University of Santiago of Chile (USACH), Santiago, Chile.,Center for the Development of Nanoscience and Nanotechnology (CEDENNA), University of Santiago of Chile (USACH), Santiago, Chile.,Technological Faculty, Food Science and Technology Department, University of Santiago of Chile (USACH), Santiago, Chile
| | - María José Galotto
- Packaging Innovation Center (LABEN), University of Santiago of Chile (USACH), Santiago, Chile.,Center for the Development of Nanoscience and Nanotechnology (CEDENNA), University of Santiago of Chile (USACH), Santiago, Chile.,Technological Faculty, Food Science and Technology Department, University of Santiago of Chile (USACH), Santiago, Chile
| | - Carol López de Dicastillo
- Packaging Innovation Center (LABEN), University of Santiago of Chile (USACH), Santiago, Chile.,Center for the Development of Nanoscience and Nanotechnology (CEDENNA), University of Santiago of Chile (USACH), Santiago, Chile.,Technological Faculty, Food Science and Technology Department, University of Santiago of Chile (USACH), Santiago, Chile
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5
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López de Dicastillo C, Garrido L, Velásquez E, Rojas A, Gavara R. Designing Biodegradable and Active Multilayer System by Assembling an Electrospun Polycaprolactone Mat Containing Quercetin and Nanocellulose between Polylactic Acid Films. Polymers (Basel) 2021; 13:polym13081288. [PMID: 33920864 PMCID: PMC8071261 DOI: 10.3390/polym13081288] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2021] [Revised: 04/04/2021] [Accepted: 04/13/2021] [Indexed: 01/23/2023] Open
Abstract
The design of multilayer systems is an innovative strategy to improve physical properties of biodegradable polymers and introduce functionality to the materials through the incorporation of an active compound into some of these layers. In this work, a trilayer film based on a sandwich of electrospun polycaprolactone (PCL) fibers (PCLé) containing quercetin (Q) and cellulose nanocrystals (CNC) between extruded polylactic acid (PLA) films was designed with the purpose of improving thermal and barrier properties and affording antioxidant activity to packaged foods. PCLé was successfully electrospun onto 70 µm-thick extruded PLA film followed by the assembling of a third 25 µm-thick commercial PLA film through hot pressing. Optical, morphological, thermal, and barrier properties were evaluated in order to study the effect of PCL layer and the addition of Q and CNC. Bilayer systems obtained after the electrospinning process of PCL onto PLA film were also evaluated. The release of quercetin from bi- and trilayer films to food simulants was also analyzed. Results evidenced that thermal treatment during thermo-compression melted PCL polymer and resulted in trilayer systems with barrier properties similar to single PLA film. Quercetin release from bi- and trilayer films followed a similar profile, but achieved highest value through the addition of CNC.
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Affiliation(s)
- Carol López de Dicastillo
- Packaging Innovation Center (LABEN-Chile), University of Santiago of Chile (USACH), Obispo Umaña 050, Santiago 9170201, Chile; (L.G.); (E.V.); (A.R.)
- Center for the Development of Nanoscience and Nanotechnology (CEDENNA), University of Santiago of Chile (USACH), Obispo Umaña 050, Santiago 9170201, Chile
- Correspondence: ; Tel.: +56-951377492
| | - Luan Garrido
- Packaging Innovation Center (LABEN-Chile), University of Santiago of Chile (USACH), Obispo Umaña 050, Santiago 9170201, Chile; (L.G.); (E.V.); (A.R.)
- Center for the Development of Nanoscience and Nanotechnology (CEDENNA), University of Santiago of Chile (USACH), Obispo Umaña 050, Santiago 9170201, Chile
| | - Eliezer Velásquez
- Packaging Innovation Center (LABEN-Chile), University of Santiago of Chile (USACH), Obispo Umaña 050, Santiago 9170201, Chile; (L.G.); (E.V.); (A.R.)
- Center for the Development of Nanoscience and Nanotechnology (CEDENNA), University of Santiago of Chile (USACH), Obispo Umaña 050, Santiago 9170201, Chile
| | - Adrián Rojas
- Packaging Innovation Center (LABEN-Chile), University of Santiago of Chile (USACH), Obispo Umaña 050, Santiago 9170201, Chile; (L.G.); (E.V.); (A.R.)
- Center for the Development of Nanoscience and Nanotechnology (CEDENNA), University of Santiago of Chile (USACH), Obispo Umaña 050, Santiago 9170201, Chile
| | - Rafael Gavara
- Packaging Laboratory, Institute of Agrochemistry and Food Technology, IATA-CSIC, Av. Agustín Escardino 7, 46980 Paterna, Spain;
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6
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Design of active electrospun mats with single and core-shell structures to achieve different curcumin release kinetics. J FOOD ENG 2020. [DOI: 10.1016/j.jfoodeng.2019.109900] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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7
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Improved Thermal Processing of Polylactic Acid/Oxidized Starch Composites and Flame-Retardant Behavior of Intumescent Non-Wovens. COATINGS 2020. [DOI: 10.3390/coatings10030291] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Thermoplastic processing and spinning of native starch is very challenging due to (a) the linear and branched polymers (amylose and amylopectin) present in its structure and (b) the presence of inter-and-intramolecular hydrogen bond linkages in its macromolecules that restrict the molecular chain mobility. Therefore, in this study, oxidized starch (OS) (obtained after oxidation of native starch with sodium perborate) was melt-blended with polylactic acid (PLA) polymer to prepare PLA/OS blends that were then mixed together with ammonium polyphosphate (APP), a halogen-free flame retardant (FR) used as acid donor in intumescent formulations on twin-screw extruder to prepare PLA/OS/APP composites. OS with different concentrations also served as bio-based carbonic source in intumescent formulations. PLA/OS/APP composites were melt spun to multifilament fibers on pilot scale melt-spinning machine and their crystallinity and mechanical properties were optimized by varying spinning parameters. The crystallinity of the fibers was studied by differential scanning calorimetry and thermal stabilities were analyzed by thermogravimetric analysis. Scanning electron microscopy was used to investigate the surface morphology and dispersion of the additives in the fibers. Needle-punched non-woven fabrics from as prepared melt-spun PLA/OS/APP fibers were developed and their fire properties such as heat release rate, total heat release, time to ignition, residual mass % etc. by cone calorimetry test were measured. It was found that PLA/OS/APP composites can be melt spun to multifilament fibers and non-woven flame-retardant fabrics produced thereof can be used in industrial FR applications.
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8
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López de Dicastillo C, Patiño Vidal C, Falcó I, Sánchez G, Márquez P, Escrig J. Antimicrobial Bilayer Nanocomposites Based on the Incorporation of As-Synthetized Hollow Zinc Oxide Nanotubes. NANOMATERIALS 2020; 10:nano10030503. [PMID: 32168893 PMCID: PMC7153247 DOI: 10.3390/nano10030503] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/29/2020] [Revised: 03/04/2020] [Accepted: 03/06/2020] [Indexed: 11/30/2022]
Abstract
An antimicrobial polymeric bilayer structure based on the application of an acrylic coating containing hollow zinc oxide nanotubes over a polymeric substrate was developed in this work. Firstly, zinc oxide nanotubes (ZnONT) were obtained by an atomic layer deposition (ALD) process over electrospun polyvinyl alcohol nanofibers followed by polymer removal through calcination with the purpose of obtaining antimicrobial nanostructures with a high specific area. Parameters of electrospinning, ALD, and calcination processes were set in order to obtain successfully hollow zinc oxide nanotubes. Morphological studies through scanning electron microscopy (SEM) and transmission electron microscopy (TEM) microscopies confirmed the morphological structure of ZnONT with an average diameter of 180 nm and thickness of approximately 60 nm. Thermal and X-ray diffraction (XRD) analyses provided evidence that calcination completely removed the polymer, resulting in a crystalline hexagonal wurtzite structure. Subsequently, ZnONT were incorporated into a polymeric coating over a polyethylene extruded film at two concentrations: 0.5 and 1 wt. % with respect to the polymer weight. An antimicrobial analysis of developed antimicrobial materials was performed following JIS Z2801 against Staphylococcus aureus and Escherichia coli. When compared to active materials containing commercial ZnO nanoparticles, materials containing ZnONT presented higher microbial inhibition principally against Gram-negative bacteria, whose reduction was total for films containing 1 wt. % ZnONT. Antiviral studies were also performed, but these materials did not present significant viral reduction.
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Affiliation(s)
- Carol López de Dicastillo
- Center of Innovation in Packaging (LABEN), Department of Food Science and Technology, Technology Faculty, University of Santiago de Chile (USACH), Santiago 9170201, Chile;
- CEDENNA (Center for the Development of Nanoscience and Nanotechnology), Santiago 9170124, Chile; (P.M.); (J.E.)
- Correspondence:
| | - Cristian Patiño Vidal
- Center of Innovation in Packaging (LABEN), Department of Food Science and Technology, Technology Faculty, University of Santiago de Chile (USACH), Santiago 9170201, Chile;
- CEDENNA (Center for the Development of Nanoscience and Nanotechnology), Santiago 9170124, Chile; (P.M.); (J.E.)
| | - Irene Falcó
- Department of Preservation and Food Safety Technologies, Institute of Agrochemistry and Food technology (IATA-CSIC), 46980 Paterna, Valencia, Spain; (I.F.); (G.S.)
| | - Gloria Sánchez
- Department of Preservation and Food Safety Technologies, Institute of Agrochemistry and Food technology (IATA-CSIC), 46980 Paterna, Valencia, Spain; (I.F.); (G.S.)
| | - Paulina Márquez
- CEDENNA (Center for the Development of Nanoscience and Nanotechnology), Santiago 9170124, Chile; (P.M.); (J.E.)
- Department of Physics, University of Santiago de Chile (USACH), Santiago 9170124, Chile
| | - Juan Escrig
- CEDENNA (Center for the Development of Nanoscience and Nanotechnology), Santiago 9170124, Chile; (P.M.); (J.E.)
- Department of Physics, University of Santiago de Chile (USACH), Santiago 9170124, Chile
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9
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Development of Bilayer Biodegradable Composites Containing Cellulose Nanocrystals with Antioxidant Properties. Polymers (Basel) 2019; 11:polym11121945. [PMID: 31779266 PMCID: PMC6960804 DOI: 10.3390/polym11121945] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2019] [Revised: 11/13/2019] [Accepted: 11/22/2019] [Indexed: 12/20/2022] Open
Abstract
The interest in the development of novel biodegradable composites has increased over last years, and multilayer composites allow the design of materials with functionality and improved properties. In this work, bilayer structures based on a coated zein layer containing quercetin and cellulose nanocrystals (CNC) over an extruded poly(lactic acid) (PLA) layer were developed and characterized. Bilayer composites were successfully obtained and presented a total thickness of approx. 90 µm. The coated zein layer and quercetin gave a yellowish tone to the composites. The incorporation of the zein layer containing CNC decreased the volatile release rate during thermal degradation. Regarding to mechanical properties, bilayer composites presented lower brittleness and greater ductility evidenced by a lower Young’s modulus and higher elongation values. Water permeability values of bilayer composites greatly increased with humidity and the zein coated layer containing quercetin increased this effect. Experimental data of quercetin release kinetics from bilayer structures indicated a higher release for an alcoholic food system, and the incorporation of cellulose nanocrystals did not influence the quercetin diffusion process.
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10
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de Dicastillo CL, Patiño C, Galotto MJ, Vásquez-Martínez Y, Torrent C, Alburquenque D, Pereira A, Escrig J. Novel hollow titanium dioxide nanospheres with antimicrobial activity against resistant bacteria. BEILSTEIN JOURNAL OF NANOTECHNOLOGY 2019; 10:1716-1725. [PMID: 31501743 PMCID: PMC6720579 DOI: 10.3762/bjnano.10.167] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/21/2019] [Accepted: 07/30/2019] [Indexed: 05/19/2023]
Abstract
The search for and synthesis of new antimicrobial nanostructures is important to reduce microbial incidence that induces infectious diseases and to aid in the antibiotic resistance crisis, which are two of the most pressing issues in global public health. In this work, novel, hollow, calcined titanium dioxide nanospheres (CSTiO2) were successfully synthesized for the first time through the combination of electrospinning and atomic layer deposition techniques. Poly(vinylpyrrolidone) (PVP) electrosprayed spherical particles were double-coated with alumina and titanium dioxide, and after a calcination process, hollow nanospheres were obtained with a radius of approximately 345 nm and shell thickness of 17 nm. The structural characterization was performed using electron microscopy, and X-ray diffraction and small-angle X-ray diffraction evidenced an anatase titanium dioxide crystalline structure. Thermogravimetric analysis and Fourier-transform infrared spectroscopy studies demonstrated the absence of polymer residue after the calcination process. The antimicrobial properties of the developed CSTiO2 hollow nanospheres were evaluated against different bacteria, including resistant E. coli and S. aureus strains, and when compared to commercial TiO2 nanoparticles, CSTiO2 nanospheres exhibited superior performance. In addition, the positive effect of UV irradiation on the antimicrobial activity was demonstrated.
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Affiliation(s)
- Carol López de Dicastillo
- Food Packaging Laboratory (Laben-Chile), Department of Science and Food Technology, Faculty of Technology, Universidad de Santiago de Chile (USACH), Obispo Umaña 050, 9170201 Santiago, Chile
- Center for the Development of Nanoscience and Nanotechnology (CEDENNA), 9170124 Santiago, Chile
| | - Cristian Patiño
- Food Packaging Laboratory (Laben-Chile), Department of Science and Food Technology, Faculty of Technology, Universidad de Santiago de Chile (USACH), Obispo Umaña 050, 9170201 Santiago, Chile
- Center for the Development of Nanoscience and Nanotechnology (CEDENNA), 9170124 Santiago, Chile
| | - María José Galotto
- Food Packaging Laboratory (Laben-Chile), Department of Science and Food Technology, Faculty of Technology, Universidad de Santiago de Chile (USACH), Obispo Umaña 050, 9170201 Santiago, Chile
- Center for the Development of Nanoscience and Nanotechnology (CEDENNA), 9170124 Santiago, Chile
| | - Yesseny Vásquez-Martínez
- Program Center for Applied Biomedical Research, School of Medicine, Faculty of Medical Sciences, University of Santiago de Chile, 9170022 Santiago, Chile
- Department of Biology, Faculty of Chemistry and Biology, University of Santiago de Chile, Santiago 9170022, Chile
| | - Claudia Torrent
- Department of Biology, Faculty of Chemistry and Biology, University of Santiago de Chile, Santiago 9170022, Chile
| | - Daniela Alburquenque
- Department of Physics, Universidad de Santiago de Chile (USACH), Av. Ecuador 3493, 9170124 Santiago, Chile
| | - Alejandro Pereira
- Center for the Development of Nanoscience and Nanotechnology (CEDENNA), 9170124 Santiago, Chile
- Department of Sciences, Faculty of Liberal Arts, University Adolfo Ibáñez, 7941169 Santiago, Chile
| | - Juan Escrig
- Center for the Development of Nanoscience and Nanotechnology (CEDENNA), 9170124 Santiago, Chile
- Department of Physics, Universidad de Santiago de Chile (USACH), Av. Ecuador 3493, 9170124 Santiago, Chile
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11
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Vadas D, Kmetykó D, Marosi G, Bocz K. Application of Melt-Blown Poly(lactic acid) Fibres in Self-Reinforced Composites. Polymers (Basel) 2018; 10:E766. [PMID: 30960691 PMCID: PMC6403755 DOI: 10.3390/polym10070766] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2018] [Revised: 07/10/2018] [Accepted: 07/10/2018] [Indexed: 11/20/2022] Open
Abstract
The aim of our research was to produce poly(lactic acid) (PLA) fibres with diameters in the micrometer size range, serving as the reinforcing phase in self-reinforced (SR) PLA composites. Nonwoven PLA mats were manufactured by solvent-free melt-blowing technology. Three types of PLA differing in d-lactide content were processed with a productivity as high as 36 g/h. The crystallinity of the PLA microfibres was enhanced by thermal annealing. A 2⁻3-fold increase in the degree of crystallinity was obtained, as measured by differential scanning calorimetry (DSC). Fibre diameters between 2⁻14 µm were revealed by scanning electron microscopy (SEM). Static tensile tests were performed on the nonwoven mats, showing the reduced moduli of the annealed fibres due the amorphous relaxation. The PLA mats were processed via the hot compaction technique and formed into SR⁻PLA composites. The morphological and mechanical properties of the obtained microstructural composites were comprehensively studied. Composites prepared from annealed, thermally more stable PLA nonwoven mats showed superior mechanical properties; the tensile strength improved by 47% due to the higher residual fibre content.
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Affiliation(s)
- Dániel Vadas
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, Budafoki út 8, H-1111 Budapest, Hungary.
| | - Dávid Kmetykó
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, Budafoki út 8, H-1111 Budapest, Hungary.
| | - György Marosi
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, Budafoki út 8, H-1111 Budapest, Hungary.
| | - Katalin Bocz
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, Budafoki út 8, H-1111 Budapest, Hungary.
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12
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Ashraf R, Sofi HS, Malik A, Beigh MA, Hamid R, Sheikh FA. Recent Trends in the Fabrication of Starch Nanofibers: Electrospinning and Non-electrospinning Routes and Their Applications in Biotechnology. Appl Biochem Biotechnol 2018; 187:47-74. [PMID: 29882194 DOI: 10.1007/s12010-018-2797-0] [Citation(s) in RCA: 37] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2018] [Accepted: 05/25/2018] [Indexed: 01/11/2023]
Abstract
Electrospinning a versatile and the most preferred technique for the fabrication of nanofibers has revolutionized by opening unlimited avenues in biomedical fields. Presently, the simultaneous functionalization and/or post-modification of as-spun nanofibers with biomolecules has been explored, to serve the distinct goals in the aforementioned field. Starch is one of the most abundant biopolymers on the earth. Besides, being biocompatible and biodegradable in nature, it has unprecedented properties of gelatinization and retrogradation. Therefore, starch has been used in numerous ways for wide range of applications. Keeping these properties in consideration, the present article summarizes the recent expansion in the fabrication of the pristine/modified starch-based composite scaffolds by electrospinning along with their possible applications. Apart from electrospinning technique, this review will also provide the comprehensive information on various other techniques employed in the fabrication of the starch-based nanofibers. Furthermore, we conclude with the challenges to be overcome in the fabrication of nanofibers by the electrospinning technique and future prospects of starch-based fabricated scaffolds for exploration of its applications.
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Affiliation(s)
- Roqia Ashraf
- Department of Nanotechnology, University of Kashmir, Srinagar, Jammu and Kashmir, 190006, India
| | - Hasham S Sofi
- Department of Nanotechnology, University of Kashmir, Srinagar, Jammu and Kashmir, 190006, India
| | - Aijaz Malik
- Center of Data Mining and Biomedical Informatics, Faculty of Medical technology, Mahidol University, Salaya, 73170, Thailand
| | - Mushtaq A Beigh
- Department of Nanotechnology, University of Kashmir, Srinagar, Jammu and Kashmir, 190006, India
| | - Rabia Hamid
- Department of Nanotechnology, University of Kashmir, Srinagar, Jammu and Kashmir, 190006, India.,Department of Biochemistry, University of Kashmir, Srinagar, Jammu and Kashmir, 190006, India
| | - Faheem A Sheikh
- Department of Nanotechnology, University of Kashmir, Srinagar, Jammu and Kashmir, 190006, India.
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Passos de Oliveira Santos R, Fernanda Rossi P, Ramos LA, Frollini E. Renewable Resources and a Recycled Polymer as Raw Materials: Mats from Electrospinning of Lignocellulosic Biomass and PET Solutions. Polymers (Basel) 2018; 10:E538. [PMID: 30966572 PMCID: PMC6415374 DOI: 10.3390/polym10050538] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2018] [Revised: 05/10/2018] [Accepted: 05/14/2018] [Indexed: 11/17/2022] Open
Abstract
Interest in the use of renewable raw materials in the preparation of materials has been growing uninterruptedly in recent decades. The aim of this strategy is to offer alternatives to the use of fossil fuel-based raw materials and to meet the demand for materials that are less detrimental to the environment after disposal. In this context, several studies have been carried out on the use of lignocellulosic biomass and its main components (cellulose, hemicelluloses, and lignin) as raw materials for polymeric materials. Lignocellulosic fibers have a high content of cellulose, but there has been a notable lack of investigations on application of the electrospinning technique for solutions prepared from raw lignocellulosic biomass, even though the presence of cellulose favors the alignment of the fiber chains during electrospinning. In this investigation, ultrathin (submicrometric) and nanoscale aligned fibers were successfully prepared via electrospinning (room temperature) of solutions prepared with different contents of lignocellulosic sisal fibers combined with recycled poly(ethylene terephthalate) (PET) using trifluoroacetic acid (TFA) as solvent. The "macro" fibers were deconstructed by the action of TFA, resulting in solutions containing their constituents, i.e., cellulose, hemicelluloses, and lignin, in addition to PET. The "macro" sisal fibers were reconstructed at the nanometer and submicrometric scale from these solutions. The SEM micrographs of the mats containing the components of sisal showed distinct fiber networks, likely due to differences in the solubility of these components in TFA and in their dielectric constants. The mechanical properties of the mats (dynamic mechanical analysis, DMA, and tensile properties) were evaluated with the samples positioned both in the direction (dir) of and in opposition (op) to the alignment of the nano and ultrathin fibers, which can be considered a novelty in the analysis of this type of material. DMA showed superior values of storage modulus (E' at 30 °C) for the mats characterized in the preferential direction of fiber alignment. For example, for mats obtained from solutions prepared from a 0.4 ratio of sisal fibers/PET, Sisal/PET0.40dir presented a high E' value of 765 MPa compared to Sisal/PET0.40op that presented an E' value of 88.4 MPa. The fiber alignment did not influence the Tg values (from tan δ peak) of electrospun mats with the same compositions, as they presented similar values for this property. The tensile properties of the electrospun mats were significantly impacted by the alignment of the fibers: e.g., Sisal/PET0.40dir presented a high tensile strength value of 15.72 MPa, and Sisal/PET0.40op presented a value of approximately 2.5 MPa. An opposite trend was observed regarding the values of elongation at break for these materials. Other properties of the mats are also discussed; such as the index of fiber alignment, average porosity, and surface contact angle. To our knowledge, this is the first time that the influence of fiber alignment on the properties of electrospun mats based on untreated lignocellulosic biomass combined with a recycled polymer, such as PET, has been evaluated. The mats obtained in this study have potential for diversified applications, such as reinforcement for polymeric matrices in nanocomposites, membranes for filtration, and support for enzymes, wherein the fiber alignment, together with other evaluated properties, can impact their effectiveness in these applications.
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Affiliation(s)
- Rachel Passos de Oliveira Santos
- Macromolecular Materials and Lignocellulosic Fibers Group, Center of Research on Science and Technology of BioResources, Institute of Chemistry of São Carlos, University of São Paulo, CP 780, 13560-970 São Carlos, SP, Brazil.
| | - Patrícia Fernanda Rossi
- Macromolecular Materials and Lignocellulosic Fibers Group, Center of Research on Science and Technology of BioResources, Institute of Chemistry of São Carlos, University of São Paulo, CP 780, 13560-970 São Carlos, SP, Brazil.
| | - Luiz Antônio Ramos
- Macromolecular Materials and Lignocellulosic Fibers Group, Center of Research on Science and Technology of BioResources, Institute of Chemistry of São Carlos, University of São Paulo, CP 780, 13560-970 São Carlos, SP, Brazil.
| | - Elisabete Frollini
- Macromolecular Materials and Lignocellulosic Fibers Group, Center of Research on Science and Technology of BioResources, Institute of Chemistry of São Carlos, University of São Paulo, CP 780, 13560-970 São Carlos, SP, Brazil.
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14
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López de Dicastillo C, Patiño C, Galotto MJ, Palma JL, Alburquenque D, Escrig J. Novel Antimicrobial Titanium Dioxide Nanotubes Obtained through a Combination of Atomic Layer Deposition and Electrospinning Technologies. NANOMATERIALS (BASEL, SWITZERLAND) 2018; 8:E128. [PMID: 29495318 PMCID: PMC5853759 DOI: 10.3390/nano8020128] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/23/2017] [Revised: 02/10/2018] [Accepted: 02/13/2018] [Indexed: 01/23/2023]
Abstract
The search for new antimicrobial substances has increased in recent years. Antimicrobial nanostructures are one of the most promising alternatives. In this work, titanium dioxide nanotubes were obtained by an atomic layer deposition (ALD) process over electrospun polyvinyl alcohol nanofibers (PVN) at different temperatures with the purpose of obtaining antimicrobial nanostructures with a high specific area. Electrospinning and ALD parameters were studied in order to obtain PVN with smallest diameter and highest deposition rate, respectively. Chamber temperature was a key factor during ALD process and an appropriate titanium dioxide deposition performance was achieved at 200 °C. Subsequently, thermal and morphological analysis by SEM and TEM microscopies revealed hollow nanotubes were obtained after calcination process at 600 °C. This temperature allowed complete polymer removal and influenced the resulting anatase crystallographic structure of titanium dioxide that positively affected their antimicrobial activities. X-ray analysis confirmed the change of titanium dioxide crystallographic structure from amorphous phase of deposited PVN to anatase crystalline structure of nanotubes. These new nanostructures with very large surface areas resulted in interesting antimicrobial properties against Gram-positive and Gram-negative bacteria. Titanium dioxide nanotubes presented the highest activity against Escherichia coli with 5 log cycles reduction at 200 μg/mL concentration.
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Affiliation(s)
- Carol López de Dicastillo
- Food Packaging Laboratory (Laben-Chile), Department of Science and Food Technology, Faculty of Technology, Universidad de Santiago de Chile (USACH), Obispo Umaña 050, 9170201 Santiago, Chile.
- Center for the Development of Nanoscience and Nanotechnology (CEDENNA), 9170124 Santiago, Chile.
| | - Cristian Patiño
- Food Packaging Laboratory (Laben-Chile), Department of Science and Food Technology, Faculty of Technology, Universidad de Santiago de Chile (USACH), Obispo Umaña 050, 9170201 Santiago, Chile.
- Center for the Development of Nanoscience and Nanotechnology (CEDENNA), 9170124 Santiago, Chile.
| | - María Jose Galotto
- Food Packaging Laboratory (Laben-Chile), Department of Science and Food Technology, Faculty of Technology, Universidad de Santiago de Chile (USACH), Obispo Umaña 050, 9170201 Santiago, Chile.
- Center for the Development of Nanoscience and Nanotechnology (CEDENNA), 9170124 Santiago, Chile.
| | - Juan Luis Palma
- Center for the Development of Nanoscience and Nanotechnology (CEDENNA), 9170124 Santiago, Chile.
- Department of Basic Sciences, Engineering Faculty, CIDES, Universidad Central de Chile, Santa Isabel 1186, 8330601 Santiago, Chile.
| | - Daniela Alburquenque
- Center for the Development of Nanoscience and Nanotechnology (CEDENNA), 9170124 Santiago, Chile.
- Department of Physics, Universidad de Santiago de Chile (USACH), Av. Ecuador 3493, 9170124 Santiago, Chile.
| | - Juan Escrig
- Center for the Development of Nanoscience and Nanotechnology (CEDENNA), 9170124 Santiago, Chile.
- Department of Physics, Universidad de Santiago de Chile (USACH), Av. Ecuador 3493, 9170124 Santiago, Chile.
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Aldica GV, Ciurea ML, Chipara DM, Lepadatu AM, Lozano K, Stavarache I, Popa S, Chipara M. Isotactic polypropylene-vapor grown carbon nanofibers composites: Electrical properties. J Appl Polym Sci 2017. [DOI: 10.1002/app.45297] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Gheorghe Virgil Aldica
- National Institute of Materials Physics; Laboratory of Magnetism and Superconductivity; Atomistilor 105 Bis Magurele Ilfov 077125 Romania
| | - Magdalena Lidia Ciurea
- National Institute of Materials Physics; Laboratory of Magnetism and Superconductivity; Atomistilor 105 Bis Magurele Ilfov 077125 Romania
- Academy of Romanian Scientists; 54 Splaiul Independentei 050094 Bucuresti Romania
| | - Dorina Magdalena Chipara
- Department of Physics and Geology; The University of Texas Rio Grande Valley; Edinburg Texas 78539
| | - Ana Maria Lepadatu
- National Institute of Materials Physics; Laboratory of Magnetism and Superconductivity; Atomistilor 105 Bis Magurele Ilfov 077125 Romania
| | - Karen Lozano
- Department of Physics and Geology; The University of Texas Rio Grande Valley; Edinburg Texas 78539
| | - Ionel Stavarache
- National Institute of Materials Physics; Laboratory of Magnetism and Superconductivity; Atomistilor 105 Bis Magurele Ilfov 077125 Romania
| | - Stelian Popa
- National Institute of Materials Physics; Laboratory of Magnetism and Superconductivity; Atomistilor 105 Bis Magurele Ilfov 077125 Romania
| | - Mircea Chipara
- Department of Physics and Geology; The University of Texas Rio Grande Valley; Edinburg Texas 78539
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